/* Einsteinpedia — "chalk on a night sky": a blackboard that opens onto spacetime. */

:root {
  --bg: #090d18;
  --bg-raised: #111728;
  --bg-sunk: #060911;
  --ink: #ece8dc;
  --ink-soft: #b4bccb;
  --ink-faint: #7f899c;
  --rule: rgba(180, 196, 230, 0.16);
  --grid: rgba(127, 211, 230, 0.055);
  --gold: #e9c46a;
  --light: #7fd3e6;
  --rose: #e58f8f;
  --leaf: #9bd39b;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --math: "STIX Two Math", "Cambria Math", "Latin Modern Math", "STIXGeneral", math, serif;
  --measure: 68ch;
  --gutter: clamp(16px, 4vw, 48px);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--bg);
  /* graph paper */
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.7;
  overflow-x: hidden;
}

a { color: var(--light); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { color: var(--gold); }
:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; border-radius: 2px; }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.15; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(2.2rem, 6vw, 4rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 3.4vw, 2.1rem); }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }

math { font-family: var(--math); }
math[display="block"] { display: block math; }
.tml-sml-pad { padding-left: 0.05em; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; z-index: 10; background: var(--gold); color: #111; padding: 8px 12px; }

.kicker {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
  margin: 0 0 0.9em;
}
.kicker a { color: inherit; }
.lede { font-size: clamp(1.1rem, 2.2vw, 1.3rem); color: var(--ink-soft); max-width: 60ch; }

/* ── header ─────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 5;
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 24px;
  padding: 10px var(--gutter);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.brand { font-size: 1.35rem; font-weight: 600; color: var(--ink); text-decoration: none; letter-spacing: 0.01em; }
.brand span, h1 span { color: var(--gold); font-style: italic; }
.site-header nav { flex: 1 1 320px; min-width: 0; }
.site-header ul { display: flex; gap: 4px 18px; flex-wrap: wrap; list-style: none; margin: 0; padding: 0; }
.site-header nav a {
  font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-soft); text-decoration: none; padding: 6px 0; display: inline-block;
  border-bottom: 1px solid transparent;
}
.site-header nav a:hover, .site-header nav a[aria-current] { color: var(--gold); border-bottom-color: var(--gold); }

.search { display: flex; gap: 6px; }
.search input {
  width: 11rem; max-width: 46vw; padding: 7px 10px;
  background: var(--bg-sunk); color: var(--ink);
  border: 1px solid var(--rule); border-radius: 3px; font: inherit; font-size: 0.9rem;
}
.search button, .button {
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase;
  padding: 8px 14px; border: 1px solid var(--rule); border-radius: 3px;
  background: transparent; color: var(--ink); cursor: pointer; text-decoration: none; display: inline-block;
}
.search button:hover, .button:hover { border-color: var(--gold); color: var(--gold); }
.button.primary { background: var(--gold); border-color: var(--gold); color: #14110a; }
.button.primary:hover { filter: brightness(1.1); color: #14110a; }
.search-large { margin-top: 1.5rem; }
.search-large input { width: min(32rem, 100%); max-width: none; flex: 1; padding: 12px 14px; font-size: 1.05rem; }

/* ── hero ───────────────────────────────────────────── */
.hero {
  position: relative; isolation: isolate; overflow: hidden;
  min-height: min(88vh, 860px);
  display: grid; align-items: center;
  padding: 72px var(--gutter) 96px;
  border-bottom: 1px solid var(--rule);
  background: radial-gradient(120% 90% at 50% 110%, color-mix(in srgb, var(--light) 12%, transparent), transparent 60%);
}
/* The spacetime sheet sits behind every page; it is brightest on the home page. */
#spacetime { position: fixed; inset: 0; width: 100vw; height: 100vh; z-index: -1; opacity: 0.4; pointer-events: none; }
body.home #spacetime { opacity: 1; }
.marginalia { position: absolute; inset: 0; z-index: -1; pointer-events: none; color: var(--ink-faint); }
.marginalia span { position: absolute; opacity: 0.5; font-size: clamp(0.9rem, 1.6vw, 1.25rem); animation: drift 14s ease-in-out infinite alternate; }
.marginalia .m0 { top: 10%; right: 6%; transform: rotate(-4deg); }
.marginalia .m1 { top: 24%; right: 20%; transform: rotate(3deg); animation-delay: -3s; }
.marginalia .m2 { top: 9%; right: 30%; transform: rotate(2deg); animation-delay: -6s; }
.marginalia .m3 { top: 40%; right: 5%; transform: rotate(-2deg); animation-delay: -9s; }
.marginalia .m4 { top: 84%; right: 30%; transform: rotate(4deg); animation-delay: -5s; }
.marginalia .m5 { top: 88%; right: 6%; transform: rotate(-3deg); animation-delay: -11s; }
@media (max-width: 900px) { .marginalia { display: none; } }
@keyframes drift { from { translate: 0 0; } to { translate: 0 -14px; } }

.hero-inner { max-width: 44rem; }
.hero h1 { font-size: clamp(3rem, 11vw, 6.5rem); margin-bottom: 0.15em; }
.hero-eq {
  margin: 1.6rem 0 0.4rem; padding: 18px 22px; width: fit-content; max-width: 100%;
  font-size: clamp(1.1rem, 3.4vw, 1.8rem); color: var(--ink);
  border-left: 3px solid var(--gold);
  background: color-mix(in srgb, var(--bg) 62%, transparent);
  overflow-x: auto;
}
.hero-eq-caption { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.06em; color: var(--ink-faint); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 1.8rem; }

/* ── bands & cards ──────────────────────────────────── */
.band, .page-head, .article, .cards-wide, .timeline, .table-wrap, main > section, .results, .empty {
  width: min(1120px, 100%); margin-inline: auto; padding-inline: var(--gutter);
}
.band { padding-block: clamp(48px, 8vw, 96px); border-bottom: 1px solid var(--rule); }
body.home .band { background: color-mix(in srgb, var(--bg) 82%, transparent); width: auto; max-width: none; padding-inline: max(var(--gutter), calc((100% - 1120px) / 2 + var(--gutter))); }
.band-head { margin-bottom: 2rem; max-width: 62ch; }
.band-head p:last-child { color: var(--ink-soft); margin-top: 0.8em; }
.page-head { padding-block: clamp(40px, 7vw, 88px) clamp(20px, 3vw, 36px); }
.article > .page-head { padding-inline: 0; }
.more { font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.06em; margin-top: 1.6rem; }

.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 18px; grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr)); }
/* .cards resets margin and padding, so the page-level grid restates its centering here. */
.cards-wide { margin-inline: auto; padding: 0 var(--gutter) 80px; }
.card a {
  display: flex; flex-direction: column; gap: 8px; height: 100%;
  padding: 22px; color: var(--ink); text-decoration: none;
  background: var(--bg-raised); border: 1px solid var(--rule); border-radius: 4px;
  transition: border-color 0.2s, translate 0.2s;
}
.card a:hover { border-color: var(--gold); translate: 0 -3px; }
.card h3 { color: var(--ink); }
.card p { color: var(--ink-soft); font-size: 0.96rem; line-height: 1.55; margin: 0; }
.card-years { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; color: var(--gold); }
.card-eq { color: var(--light); font-size: 1.02rem; overflow-x: auto; padding: 4px 0; }
.card-eq math[display="block"] { text-align: left; }

.miracle { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr)); border: 1px solid var(--rule); border-radius: 4px; overflow: hidden; }
.miracle a { display: block; height: 100%; padding: 22px; text-decoration: none; color: var(--ink); background: var(--bg-raised); border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); margin: 0 -1px -1px 0; }
.miracle a:hover { background: color-mix(in srgb, var(--gold) 12%, var(--bg-raised)); }
.miracle-month { display: block; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--gold); margin-bottom: 6px; }
.miracle-title { font-size: 1.2rem; font-weight: 600; line-height: 1.25; }

.stats { list-style: none; padding: 0; margin: 0 0 28px; display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(min(210px, 100%), 1fr)); }
.stats a { display: block; height: 100%; padding: 18px 0 0; border-top: 2px solid var(--gold); color: var(--ink); text-decoration: none; }
.stat-figure { display: block; font-size: clamp(2rem, 4.5vw, 2.8rem); line-height: 1.1; color: var(--gold); font-variant-numeric: lining-nums; }
.stat-label { display: block; color: var(--ink-soft); font-size: 0.95rem; line-height: 1.5; margin-top: 6px; }
.stats a:hover .stat-label { color: var(--ink); }

/* ── quotes ─────────────────────────────────────────── */
.quote { margin: 0; }
.quote blockquote { margin: 0; }
.quote blockquote p { font-size: clamp(1.25rem, 3vw, 1.9rem); line-height: 1.35; font-style: italic; margin: 0 0 0.6em; text-wrap: balance; }
.quote blockquote p::before { content: "“"; color: var(--gold); }
.quote blockquote p::after { content: "”"; color: var(--gold); }
.quote figcaption { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.04em; color: var(--ink-faint); }
.band-quote { text-align: center; }
.band-quote .quote { max-width: 46rem; margin-inline: auto; }
main > section { padding-block: 16px 56px; }
main > section > h2 { margin-bottom: 1.4rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--rule); }
.quote-grid { display: grid; gap: 22px; grid-template-columns: repeat(auto-fill, minmax(min(320px, 100%), 1fr)); }
.quote-grid .quote { padding: 22px; background: var(--bg-raised); border: 1px solid var(--rule); border-radius: 4px; }
.quote-grid .quote blockquote p { font-size: 1.18rem; }
.never-said ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 18px; }
.never-said li { padding-left: 18px; border-left: 2px solid var(--rose); }
.never-said p { margin: 0; color: var(--ink-soft); }
.never-said .struck { color: var(--ink); font-style: italic; text-decoration: line-through; text-decoration-color: var(--rose); margin-bottom: 4px; }

/* ── article ────────────────────────────────────────── */
.article { padding-bottom: 80px; }
.plate {
  margin: 8px 0 36px; padding: clamp(20px, 4vw, 40px) 20px;
  background: var(--bg-sunk); border: 1px solid var(--rule); border-radius: 4px;
  box-shadow: inset 0 0 0 6px var(--bg), inset 0 0 0 7px var(--rule);
  font-size: clamp(1.2rem, 3.6vw, 2rem); text-align: center; color: var(--gold); overflow-x: auto;
}
.prose { max-width: var(--measure); }
.prose h2 { margin: 2.2em 0 0.6em; padding-top: 0.6em; border-top: 1px solid var(--rule); }
.prose h3 { margin: 1.8em 0 0.4em; color: var(--gold); }
.prose ul { padding-left: 1.2em; margin: 0 0 1.2em; }
.prose li { margin-bottom: 0.45em; }
.prose li::marker { color: var(--gold); }
.prose blockquote { margin: 1.4em 0; padding: 2px 0 2px 18px; border-left: 2px solid var(--gold); color: var(--ink-soft); font-style: italic; }
.prose blockquote p { margin: 0; }
.prose strong { color: var(--ink); font-weight: 600; }
.equation { margin: 1.4em 0; padding: 14px 16px; background: var(--bg-sunk); border-left: 2px solid var(--light); overflow-x: auto; font-size: 1.15rem; }
.sources, .related { margin-top: 56px; }
.sources h2, .related h2 { font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--gold); margin-bottom: 1rem; }
.sources ol { padding-left: 1.4em; margin: 0; font-size: 0.94rem; color: var(--ink-soft); max-width: var(--measure); }
.sources li { margin-bottom: 0.35em; overflow-wrap: anywhere; }

/* ── papers ─────────────────────────────────────────── */
.table-wrap { overflow-x: auto; padding-bottom: 80px; }
.papers { width: 100%; min-width: 720px; border-collapse: collapse; font-size: 0.96rem; line-height: 1.5; }
.papers th { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--gold); text-align: left; padding: 10px 14px 10px 0; border-bottom: 1px solid var(--gold); }
.papers td { padding: 14px 14px 14px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.papers .num { font-family: var(--mono); color: var(--gold); white-space: nowrap; }
.papers .original { display: block; color: var(--ink-faint); font-style: italic; font-size: 0.88rem; margin-top: 3px; }

/* ── timeline: a worldline ──────────────────────────── */
.legend { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 20px; padding: 0; margin: 1.2rem 0 0; font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-soft); }
.legend li::before, .timeline li::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 50%; background: var(--dot, var(--gold)); }
.legend li::before { margin-right: 8px; }
.cat-life { --dot: var(--gold); }
.cat-science { --dot: var(--light); }
.cat-public { --dot: var(--leaf); }
.cat-world { --dot: var(--rose); }
.timeline { list-style: none; margin-block: 0 80px; position: relative; padding-left: calc(var(--gutter) + 26px); }
.timeline::before { content: ""; position: absolute; left: calc(var(--gutter) + 4px); top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--gold), var(--light), var(--rose)); opacity: 0.55; }
.timeline li { position: relative; padding: 0 0 28px; display: grid; gap: 2px 28px; grid-template-columns: minmax(0, 11rem) minmax(0, 1fr); }
.timeline li::before { position: absolute; left: -26px; top: 0.55em; box-shadow: 0 0 0 4px var(--bg); }
.timeline time { font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.06em; color: var(--dot); padding-top: 0.2em; }
.timeline h2, .timeline h3 { font-size: 1.15rem; margin: 0 0 4px; color: var(--ink); }
.timeline p { margin: 0; color: var(--ink-soft); font-size: 0.98rem; line-height: 1.55; max-width: 62ch; }
@media (max-width: 640px) { .timeline li { grid-template-columns: minmax(0, 1fr); } }

/* ── search ─────────────────────────────────────────── */
.results { list-style: none; margin-block: 0 80px; display: grid; gap: 26px; }
.results h2 { font-size: 1.3rem; display: inline; }
.results a { text-decoration: none; }
.results p { margin: 4px 0 0; color: var(--ink-soft); max-width: var(--measure); }
.result-section { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--gold) !important; }
mark { background: color-mix(in srgb, var(--gold) 30%, transparent); color: var(--ink); padding: 0 2px; border-radius: 2px; }
.empty { padding-bottom: 80px; color: var(--ink-soft); }

/* ── footer ─────────────────────────────────────────── */
.site-footer { padding: 48px var(--gutter) 56px; border-top: 1px solid var(--rule); background: var(--bg-sunk); color: var(--ink-faint); font-size: 0.9rem; text-align: center; }
.site-footer p { max-width: 60ch; margin: 0 auto 0.6em; }
.footer-eq { font-size: 1.5rem; color: var(--gold); margin-bottom: 1rem !important; }
.footer-nav { list-style: none; display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 20px; padding: 0; margin: 1.2rem 0 0; font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.12em; text-transform: uppercase; }
.footer-nav a { color: var(--ink-soft); text-decoration: none; }
.footer-nav a:hover { color: var(--gold); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .marginalia span { animation: none; }
  .card a { transition: none; }
}

.page-head h1 { margin-bottom: 0.35em; }

.cite { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; white-space: nowrap; padding: 1px 6px; border: 1px solid var(--rule); border-radius: 3px; text-decoration: none; color: var(--ink-faint); margin-left: 4px; }
.cite:hover { color: var(--gold); border-color: var(--gold); }

/* the life timeline embedded in the About page */
.prose .life-timeline { max-width: none; margin: 1.6em 0 2.4em; }
.prose .timeline { width: auto; margin: 0; padding-left: 26px; }
.prose .timeline::before { left: 4px; }
.prose .timeline li { margin-bottom: 0; grid-template-columns: minmax(0, 9.5rem) minmax(0, 1fr); }
.prose .timeline li::marker { content: none; }
@media (max-width: 640px) { .prose .timeline li { grid-template-columns: minmax(0, 1fr); } }

/* Articles read as one centered column: heading, equation, text and sources share its edges. */
.article { width: min(880px, 100%); }
.article .prose, .article .sources ol { max-width: none; }
.article .lede { max-width: none; }